[71K20chevy]

I'm looking to get a 8 point roll cage kit to put together for my 64 GMC. I'm having trouble finding kits for 60-66 trucks, so I was wondering if anyone used a 67-72 kit and how close it was? Kind of on a tight budget which is why I'd like to steer clear from custom built. It's for a mud truck so it doesn't need to meet any NHRA certifications or anything, I just need a basic cage that fits decent.